Microwave Transmission Theory for On-Chip Ultrastrong-Coupled Magnon-Polariton in Dynamical Inductors

  We present a microwave transmission theory for recently proposed ultrastrong-coupled magnon-polariton (MP) in dynamical inductors which consist of a coil involving a magnetic insulator. Combining with the RLC-circuit and Landau-Lifshitz-Gilbert equations, we formulate the electric impedance of MP...

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Bibliographic Details
Published in:Journal of the Magnetics Society of Japan 2024/03/01, Vol.48(2), pp.21-27
Main Authors: Chiba, T., Komine, T., Aono, T.
Format: Article
Language:eng ; jpn
Subjects:
ferromagnetic resonance
hybrid quantum systems
Inductors
magnetic insulators
Magnons
microwave techniques
Microwave transmission
Polaritons
quantum information technology
Quantum phenomena
Room temperature
S parameters
Waveguides
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Summary:  We present a microwave transmission theory for recently proposed ultrastrong-coupled magnon-polariton (MP) in dynamical inductors which consist of a coil involving a magnetic insulator. Combining with the RLC-circuit and Landau-Lifshitz-Gilbert equations, we formulate the electric impedance of MP as a coupled oscillator under the corresponding principle. Based on the transmission (ABCD or F) matrix approach, we further calculate S21 being a scattering parameter for the microwave transmission measurement passing through an RLC-circuit with the dynamical inductor. By tunning the size of the dynamical inductor, we theoretically demonstrate an on-chip ultrastrong-coupled MP at room temperature, which reaches a coupling ratio about 0.55 and cooperativity about 2×105 with material parameters of Y3Fe5O12. This work paves the way for quasi-two-dimensional circuit/wave-guide based magnonics for quantum information technology.
ISSN:1882-2924
1882-2932
DOI:10.3379/msjmag.2403R002